// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_VIEWS_WIDGET_DESKTOP_AURA_X11_WINDOW_EVENT_FILTER_H_
#define UI_VIEWS_WIDGET_DESKTOP_AURA_X11_WINDOW_EVENT_FILTER_H_

#include <X11/Xlib.h>

#include "base/compiler_specific.h"
#include "base/macros.h"
#include "base/message_loop/message_loop.h"
#include "ui/events/event_handler.h"
#include "ui/gfx/x/x11_atom_cache.h"
#include "ui/gfx/x/x11_types.h"
#include "ui/views/views_export.h"

namespace aura {
class Window;
}

namespace gfx {
class Point;
}

namespace views {
class DesktopWindowTreeHost;
class NativeWidgetAura;

// An EventFilter that sets properties on X11 windows.
class VIEWS_EXPORT X11WindowEventFilter : public ui::EventHandler {
public:
    explicit X11WindowEventFilter(DesktopWindowTreeHost* window_tree_host);
    ~X11WindowEventFilter() override;

    // Overridden from ui::EventHandler:
    void OnMouseEvent(ui::MouseEvent* event) override;

private:
    // Called when the user clicked the caption area.
    void OnClickedCaption(ui::MouseEvent* event,
        int previous_click_component);

    // Called when the user clicked the maximize button.
    void OnClickedMaximizeButton(ui::MouseEvent* event);

    void ToggleMaximizedState();

    // Dispatches a _NET_WM_MOVERESIZE message to the window manager to tell it
    // to act as if a border or titlebar drag occurred.
    bool DispatchHostWindowDragMovement(int hittest,
        const gfx::Point& screen_location);

    // The display and the native X window hosting the root window.
    XDisplay* xdisplay_;
    ::Window xwindow_;

    // The native root window.
    ::Window x_root_window_;

    ui::X11AtomCache atom_cache_;

    DesktopWindowTreeHost* window_tree_host_;

    // The non-client component for the target of a MouseEvent. Mouse events can
    // be destructive to the window tree, which can cause the component of a
    // ui::EF_IS_DOUBLE_CLICK event to no longer be the same as that of the
    // initial click. Acting on a double click should only occur for matching
    // components.
    int click_component_;

    DISALLOW_COPY_AND_ASSIGN(X11WindowEventFilter);
};

} // namespace views

#endif // UI_VIEWS_WIDGET_DESKTOP_AURA_X11_WINDOW_EVENT_FILTER_H_
